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HARPA : a versatile three-dimensional Hamiltonian ray-tracing program for acoustic waves in the atmosphere above irregular terrain
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1986
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Description:HARPA stands for Hamiltonian Acoustic Ray-tracing Program for the Atmosphere. This FORTRAN computer program traces the three-dimensional paths of acoustic rays through model atmospheres by numerically integrating Hamilton's equations, which are a differential expression of Fermat's principle. The user specifies an atmospheric model by writing closed-form formulas for its three-dimensional wind and temperature (or sound-speed) distribution, and by defining the height of the reflecting terrain as a function of geographic latitude and longitude.
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Rights Information:CC0 Public Domain
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Compliance:Library
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